It is fucking horrible though, isn’t it. My parents’ house where I grew up and where they still live used to get mice quite a lot and it freaked me out. The eventually solved it by sealing every possible entry point – there used to be loads because the house is big and old. Various ventilation holes and things, my dad said he was in the garden once and he was watching a mouse approaching a previous entry point that he’d just put a brick in the way of temporarily until putting one of those proper bricks with holes in. There was a tiny gap at the top of the brick, and my dad saw the mouse squash its body flat to get through. It literally flattened its skeleton in order to get through that gap. My dad promptly filled in all the entry holes after that.

As I was growing up I became quite accustomed to encountering granules of mouse/rat poison on pieces of cardboard under various items of furniture. I also learned from my dad that mice go for chocolate on mouse-traps but not cheese. The smell of mice rotting somewhere under floorboards that would never be lifted up was also a frequent delight. Eventually the smell just goes away, see.